190 research outputs found
Bound on the neutrino magnetic moment from the Super-Kamiokande data
No full textIt is shown that recent results from the Super-Kamiokande detector constrain the tau neutrino diagonal magnetic moment to for the case of interpretation of the atmospheric neutrino anomaly. It is pointed out that the large magnetic moment of the tau neutrino could affect further understanding of the origin of the anomaly.It is shown that recent results from the Super-Kamiokande detector constrain the tau neutrino diagonal magnetic moment to for the case of interpretation of the atmospheric neutrino anomaly. It is pointed out that the large magnetic moment of the tau neutrino could affect further understanding of the origin of the anomaly.It is shown that recent results from the Super-Kamiokande detector constrain the tau neutrino diagonal magnetic moment to for the case of interpretation of the atmospheric neutrino anomaly. It is pointed out that the large magnetic moment of the tau neutrino could affect further understanding of the origin of the anomaly.It is shown that recent results from the Super-Kamiokande detector constrain the tau neutrino diagonal magnetic moment to for the case of interpretation of the atmospheric neutrino anomaly. It is pointed out that the large magnetic moment of the tau neutrino could affect further understanding of the origin of the anomaly.It is shown that recent results from the Super-Kamiokande detector constrain the tau neutrino diagonal magnetic moment to for the case of interpretation of the atmospheric neutrino anomaly. It is pointed out that the large magnetic moment of the tau neutrino could affect further understanding of the origin of the anomaly.It is shown that recent results from the Super-Kamiokande detector constrain the tau neutrino diagonal magnetic moment to for the case of interpretation of the atmospheric neutrino anomaly. It is pointed out that the large magnetic moment of the tau neutrino could affect further understanding of the origin of the anomaly.It is shown that recent results from the Super-Kamiokande detector constrain the tau neutrino diagonal magnetic moment to μ ν τ <1.3×10 −7 μ B for the case of ν μ → ν τ interpretation of the atmospheric neutrino anomaly. It is pointed out that the large magnetic moment of the tau neutrino could affect further understanding of the origin of the anomaly
Limits on νμ(νe)→ντ oscillations and tau neutrino magnetic moment from neutrino-electron scattering
No full text
The SM extensions with additional light scalar singlet, nonrenor-malizable Yukawa interactions and (g − 2)μ
No full textWe consider the SM extension with additional light real singlet scalar, right-handed neutrino and nonrenormalizable Yukawa interaction for the first two generations. We show that the proposed model can explain the observed (g – 2) muon anomaly. Phenomenological consequenses as flavour violating decays τ → μμμ, μμe, μee are briefly discussed. We also propose the UR(1) gauge generalization of the SM with complex scalar singlet and nonzero right-handed charges for the first two generations
Limits on the magnetic moment of sterile neutrino and two-photon neutrino decay
No full textIt is shown that the non-zero transition magnetic moment () between the sterile neutrino () and the muon neutrino () could be effectively searched for via the Primakoff effect, in the process of nucleus , with the subsequent decay. From the recent results of the NOMAD neutrino detector at CERN a model-independent constraint of is obtained. The limit is valid for neutrino masses up to .It is shown that the non-zero transition magnetic moment () between the sterile neutrino () and the muon neutrino () could be effectively searched for via the Primakoff effect, in the process of conversion in the external Coulomb field of a nucleus , with the subsequent decay. From the recent results of the NOMAD neutrino detector at CERN a model-independent constraint of is obtained. The limit is valid for neutrino masses up to .It is shown that the non-zero transition magnetic moment () between the sterile neutrino () and the muon neutrino () could be effectively searched for via the Primakoff effect, in the process of conversion in the external Coulomb field of a nucleus , with the subsequent decay. From the recent results of the NOMAD neutrino detector at CERN a model-independent constraint of is obtained. The limit is valid for neutrino masses up to .It is shown that the non-zero transition magnetic moment ( μ tran ) between the sterile neutrino ( ν s ) and the muon neutrino ( ν μ ) could be effectively searched for via the Primakoff effect, in the process of ν μ Z → ν s Z conversion in the external Coulomb field of a nucleus Z , with the subsequent ν s → ν μ + γ decay. From the recent results of the NOMAD neutrino detector at CERN a model-independent constraint of μ tran 2×10 13 s/ m ν 7 MeV) is obtained. The limit is valid for neutrino masses up to m ν ∼ O (1) GeV
The SM extensions with additional light scalar singlet, nonrenor-malizable Yukawa interactions and (
No full textWe consider the SM extension with additional light real singlet scalar, right-handed neutrino and nonrenormalizable Yukawa interaction for the first two generations. We show that the proposed model can explain the observed (g – 2) muon anomaly. Phenomenological consequenses as flavour violating decays τ → μμμ, μμe, μee are briefly discussed. We also propose the UR(1) gauge generalization of the SM with complex scalar singlet and nonzero right-handed charges for the first two generations
neutrino magnetic moments from the Super-Kamiokande and e-scattering data
No full textCombined results on oscillations and -scattering from the Super-Kamiokande and LAMPF experiments, respectively, limit the Dirac diagonal magnetic moment to .\ For the scheme with 3 Majorana neutrinos the LAMPF results allow the limitation of effective magnetic moment to .\ The moments in the scheme with additional Majorana light sterile neutrinos as well as experiments on stimulated radiative neutrino conversion are also discussed
Can the mirror world explain the ortho-positronium lifetime puzzle?
No full textWe suggest that the discrepant lifetime measurements of ortho-positronium can be explained by ortho-positronium oscillations into mirror ortho-positronium. This explanation can be tested in future vacuum experiments.We suggest that the discrepant lifetime measurements of ortho-positronium can be explained by ortho-positronium oscillations into mirror ortho-positronium. This explanation can be tested in future vacuum experiments.We suggest that the discrepant lifetime measurements of ortho-positronium can be explained by ortho-positronium oscillations into mirror ortho-positronium. This explanation can be tested in future vacuum experiments.We suggest that the discrepant lifetime measurements of ortho-positronium can be explained by ortho-positronium oscillations into mirror ortho-positronium. This explanation can be tested in future vacuum experiments.We suggest that the discrepant lifetime measurements of ortho-positronium can be explained by ortho-positronium oscillations into mirror ortho-positronium. This explanation can be tested in future vacuum experiments
Leptonic scalar portal: Origin of muon anomaly and dark matter?
No full textWe present a model explaining both the 4.2 muon anomaly and
the relic density of dark matter (DM) in which DM interacts with the Standard
Model (SM) via a scalar portal boson carrying both dark and SM
leptonic numbers, and mediating a nondiagonal interaction between the electron
and muon that allows transitions. The could
be produced in high-energy electron scattering off a target nuclei in the
reaction followed by the prompt invisible decay
~DM particles and searched for in events with large missing energy
accompanied by a single outgoing muon in the final state. Interestingly,
several events with a similar signature have been observed in a data sample of
electrons on target collected during 2016-2018 for the
search for light dark matter in the NA64 experiment at the CERN SPS [PRL {\bf
123}, 121801 (2019)]. Attributing so far these events to background allows us
to set first constraints on the mass and couplings while leaving at
the same time decisively probing the origin of these events and a large
fraction of the remaining parameter space to a near exiting future with the
upgraded NA64 detector or other planned experiments.Comment: 6 pages, 3 figures. References added, matches published versio
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